/*
   Copyright (c) 2012 Mizar Tools Contributors (mizartools.org)

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
/*  Contributors :
 *	2012-04-01 Marco Riccardi - initial implementation
 *
 */
package org.mizartools.system.xml;

import java.util.LinkedList;

import org.mizartools.system.ElementParseException;
import org.mizartools.system.IElement;
import org.mizartools.system.INode;
import org.mizartools.utility.xml.XMLElement;

public class ReductionRegistration implements IElement {


    public static final String NAME = "ReductionRegistration";

    private INode parentNode;

    private Reduction reduction = null;
    private Reducibility reducibility = null;

    private ReductionRegistration(INode parentNode){
        this.parentNode = parentNode;
    }

    public INode getParentNode() {
        return parentNode;
    }

    public static ReductionRegistration newInstance(INode parentNode, LinkedList<XMLElement> xmlElementList) throws ElementParseException {
        ReductionRegistration reductionRegistration = new ReductionRegistration(parentNode);
        XMLElement xmlElement = xmlElementList.poll();
        if (!xmlElement.getName().equals(NAME)){
            throw new ElementParseException(ElementParseException.NOT_VALID_ELEMENT, "XMLElement is a " + xmlElement.getName() + " not a " + NAME, xmlElementList);
        }

        if (!xmlElement.isEmpty()){
            while (true){
                xmlElement = xmlElementList.peek();
                if (xmlElement == null){
                    throw new ElementParseException(ElementParseException.UNEXPECTED_END_OF_FILE, "Unexpected end of XMLElement list");
                }
                if (xmlElement.getName().equals(NAME) && xmlElement.isEndElement()){
                    xmlElement = xmlElementList.poll();
                    break;
                }
                if (xmlElement.getName().equals("Reduction")){
                    if (reductionRegistration.reduction == null) {
                        reductionRegistration.reduction = Reduction.newInstance(reductionRegistration, xmlElementList);
                    } else { 
                        throw new ElementParseException(ElementParseException.DUPLICATE_ELEMENT, "XMLElement list contains a duplicated <Reduction> in element " + NAME, xmlElementList);
                    }
                } else 
                if (xmlElement.getName().equals("Reducibility")){
                    if (reductionRegistration.reducibility == null) {
                        reductionRegistration.reducibility = Reducibility.newInstance(reductionRegistration, xmlElementList);
                    } else { 
                        throw new ElementParseException(ElementParseException.DUPLICATE_ELEMENT, "XMLElement list contains a duplicated <Reducibility> in element " + NAME, xmlElementList);
                    }
                } else 
                    throw new ElementParseException(ElementParseException.NOT_VALID_ELEMENT, "The XMLElement " + xmlElement.getName() + " is not valid in " + NAME, xmlElementList);
            }
        }

        return reductionRegistration;
    }

    public LinkedList<XMLElement> getXMLElementList() {
        LinkedList<XMLElement> xmlElementList = new LinkedList<XMLElement>();
        XMLElement xmlElement = new XMLElement(NAME);
        boolean isEmpty = !(reduction != null || reducibility != null);
        xmlElement.setEmpty(isEmpty);
        xmlElementList.add(xmlElement);
        if (this.reduction != null){
            xmlElementList.addAll(this.reduction.getXMLElementList());
        }
        if (this.reducibility != null){
            xmlElementList.addAll(this.reducibility.getXMLElementList());
        }

        if (!isEmpty) { 
            xmlElement = new XMLElement(NAME);
            xmlElement.setEndElement(true);
            xmlElementList.add(xmlElement);
        }
        return xmlElementList;
    }

    public Reduction getReduction(){
        return reduction;
    }

    public Reducibility getReducibility(){
        return reducibility;
    }


	@Override
	public void accept(Visitor visitor) {
		if (visitor.visit(this)) {
		}
		visitor.endVisit(this);
	}

	@Override
	public String toString(){
		ToStringVisitor toStringVisitor = new ToStringVisitor();
		this.accept(toStringVisitor);
		return toStringVisitor.toString();
	}

}
